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x in (-oo:+oo)
15/100 = x/50 // - x/50
15/100-(x/50) = 0
3/20-1/50*x = 0 // - 3/20
-1/50*x = -3/20 // : -1/50
x = -3/20/(-1/50)
x = 15/2
x = 15/2
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